notepat: fix `pf is not defined` ReferenceError in sample wave blip
playWaveSound("sample") referenced `pf` (pitch factor), a local binding
that only exists inside playZoo / playLaser / playPercussion — not in
playWaveSound's scope. Switching wavetype to "sample" threw a
ReferenceError on the very first synth call, which the error display
surfaced as "act: pf not defined" because the act() handler is what
invokes setWave() → playWaveSound().
The pitch-factor is meaningless for a 30 ms UI-confirmation click, so
drop the multiplication and use the literal 800 Hz tone.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>